The Tall Rail Mounted Adjustable Bag Rider (Patented) designed to clamp to the lower picatinny rail on the MRAD, MK22, M98 (newer models) and others listed below. The rear stock must look like the provided pictures. It provides the same superior functionality as the other ABRs. The ABR has about .95 of travel with the short dowels. It ships with the LSP made 2 Hole Rail Clamps and 10-32 bolts (torque to 18 inch pounds -5/32 allen wrench). We recommend 2.25 minimum between the front of the ABR and the back of the grip so a more vertical grip is recommended. A new 'Quick adjustment' thread option (Coarse thread) is available for PRS, Hunting - use requires Hardened Dowels MRAD, MK22, M98 - all use the Short Dowel M98 - Must have a picatinny rail and not a built in monopod. Woox Furiosa - use the Short Dowel KRG Bravo - use the Short Dowel. Picatinny rail from KRG needs to be attached Woox Cobra - the Short dowels Modifications Required: XRS - use the Short Dowels (clearance into above stock is needed) Seekins Havak HIT - minor Dremel work required to open the lower slot for rear dowel clearance. Made from 6061-T6 alum and Black Anodized Class II Caliber Restrictions: .338 and smaller calibers will use the Standard dowels .33XC and larger needs the Hardened Dowels PRS & Military use needs Hardened Dowels Please note that this product may not fit other Rifles without modification. Non-Affiliation Disclaimer. We are not affiliated, associated, authorized, endorsed by, or in any way officially connected with the Barrett Firearms Manufacturing brands or Woox Brands .